Waterproof and will float. Sharp, four-level grayscale screen. 180x240 pixels, high-contrast FSTN with bright backlighting. Built in quadrifilar antenna with external connection. 500 waypoints with name and graphic symbol. 50 reversible routes with up to 50 points each, plus MOB and TracBack modes. Automatic track log. Anchor drag, approach and arrival, off-course, proximity waypoint, shallow water and deep water alarms. Lat/Lon, UTM/UPS, Maidenhead, MGRS, Loran TDs and other grids, including user grid. WAAS enabled, 12 parallel-channel GPS receiver continuously tracks and uses up to 12 satellites to compute and update your position. GPS 76: Base map: Marine database. Preloaded with worldwide cities, navaids, Americas and USA tide data. GPSMAP 76: Details base map with cities, highways, interstates, exit info, rivers, lakes. Preloaded with worldwide cities, navaids, Americas and USA tide data.